Web feeding mechanism for bag machines



March 191935. G, wl PQPPE WEB FEEDING MEcHANIsM FOR BAG MACHINES 3 Sheets-Sheet 1 Original Filed Sept. 30, 1932 Snoentor GEORGE W PoPPE Cttorncg March 19, 1935. G. w. PoPPE WEB FEEDING M'ECHANISM FOR BAG MACHINES Original Filed'Sept. 30, 1932 5 Sheets-Sheet vi?,

nvenfor GEORGE W POPPE `Cttorncg I Q n Q March 19, .1935. G. w. PoPPE i WEB FEEDING MECHANISM FOR BAG MACHINES original Filed sept. so, 419:52 5 sheets-Sheet' 3 maentor GEORGE W PoPPE Gttorneg 4 atente i9, 1935 E STATE L! "PAT 1;` orifice WEB rmznmc MEcnANisM ron nac v momias original application september 3o, 1932, serial No. 635,533. Divided and this application .lune

21, 1933, Serial No. 676,871 l s claims.

This invention relates to a machine for making bags and, more particularly to the making of .bags from relatively thin material. The improvements, however, are not limited to a machine for handlingthin material but possess advantages in the making of bags of ordinary paper.

This application is a division of my application Serial No. 635,533 led September 30, 1932.

y An object of the invention is the better control and handling of the bag material both in the web andin the tube. A- further object is the production of a more attractive and serviceable bag at minimum cost.

A feature.v of the invention resides in the provision of feeding means lengaging the web prior to folding the same into a bag tube with means whereby such feeding means may be rendered ineffective when the machine `is being first threaded up.

Further features andadvantages will become apparent from the following descriptionrand claims when taken in connection with theE accompanying drawings in whichv R Figure 1 is a longitudinal section of a bag machine embodying my improvements;`

Figure 2 is a'plan and part sectional view on the line 2 2, Figure 1;

Figure 3 is a side elevation viewed from the bottom of Figure 2; and

Figure i isan enlarged sectional view on the line 4 4, Figure 3.

Referring t6 the drawings and more particu-l larly to Figures 1 and 2 there is the usual supporting framework 2, -the side members of which carry the various shafts for driving -the usual mechanism of a bag machine, 'together with brackets for supporting the 'various auxiliary structures with which 'the Ypresent invention is more particularly concerned.

Referring to Figure 2, the machiney is drivenl from a motor 4 whose shaft is provided with a pulley 5 about which passes a belt 6 to `a pulley 7 on the shaft 8, which carries the lower pinch roller and from which shaft most of the other parts receive their drive. On this shaft is also car- .ried a sprocket wheel over which passes a sprocket chain 10 connected to a sprocket l1 on shaft l2, Figures 2 and 3. A tension roller 13 is provided to keep the sprocket chain suicently taut. The shaft i2 carries a gear that meshes with a similar gear on a stud shaft 14. The latter shaft'carries a sprocket wheel forengagement with a sprocket chain i5 by which motion is transmitted to shaft i6, the latter shaft carry- (Cl. 93-18) A i ing diesv for making" incisions in the paper web in a manner to be laterdescribed. The paper or other material which is to form the bags is fed as a web 18 from a roll 19 supported on a shaft 20 in the lower portion of the rear framework. The web passes over guide rollers 22,23 and 24 and around another roller 26 whicheverses its direction of movement, the latter roller being `carried by shaft 27.

The mechanism so far described is that which 10 is found inan ordinary bag machine and is of well-known construction. 'In said machines, however, the roller 26 served merely to reverse the direction of the web but was not itself positively driven. Y'

In the present invention one of the features thereof. consists in the provision of means for positively drivingthe roller 26 thereby relieving somewhat the strain on the paper or other bag forming material and permitting thinner and 20 more delicate material to be used toadvantage. For positively driving the roller 26 a pulley 28 is secured to the lower end of shaft 12 as viewed in Figure 3, the shaft 27 being provided with a similar pulley 29, the pulleys being connected by 25 va belt 30.

When first setting up the machine the paper is threaded into the machine by handJ and it is necf essary to give some motion to the parts in order' that the web may be properly started. With the 30 roller 26 positively driven this operation would be very difficult unless means were provided to ease up on the belt 30 during the setting-up operation.' I have therefore provided variable tension mechanism for this belt constructed as fol- 35v lows: A stud shaft 31 projects from.the side frame plate 2 as indicated in Figure 6, said shaft carrying an arm 32 supporting a pulley 33, Figure 3. Betweenthe arm 32 and the side frame plate 2 is interposed a collar 34 and friction washers 40 35 are provided on either side of the arm and a spring 36 is interposed between a nut -37 and the outsideswasher. This gives suicient tension to the arm 32 to hold it in any position to which it is positively moved. Normallyk the arm is posi- 45 tioned as shown in Figure 3 and the'roller 33 bears on the belt 30 with such pressure as will fenable it to drive the roller 26. When, however, the web is being initially threaded through the machine the roller 33 is moved away from the un- 50 der surface of the beltfthereby permitting suil- Vcient slack to, allow the roller 26 to turn freely.

' The paper web after passing over the roller 26 is delivered to mechanism which folds it into the bag tube inthe usual manner, such mechanism .2 l .including a fo'iner plate 38, the right end of four standards 42 which support two plates 43, i

Figure .2, the plates' being separated sufficiently to permit the bag tube to freely move between them. Adjustment of the plates to and from each other is effected by slotting the plates as shown in Figure 2 and providing set screws to hold them in the proper adjustment. 'I'hese plates 43 support rollers which aid in giving the necessary control of the folded web and will be referred to later in greater detail.

l The folded tube passes to the feed rollers indicated at 44, the upper pair of which are mount@ ed on shaft 45 and the lower pair on shaft 46, these shafts extending into and being supported by the side frames of the machine. Preferably the upper rollers are ,provided with facings 44a 'of rubber, leather or other material such as will provide the desired surface friction. The lower rollers are -of steel without facings. For driving the feed rollers there is provided a gear 48 on the shaft 8, Figures 2 and 3, which gear meshes with an idler 50 which in turn meshes with a gear 51' on the lower shaft .46. Near its other end but within the frame 2 the shaft 46 carries gear 52 meshing with gear 53 on the upper shaft 45. The gears 52 and 53 are of the same size so that the feed rollers rotate in a 1 to 1 ratio.

After the web has been formed into a bag tube by being folded over the former and passes between the feed rollers 44 it is severed into a bag .length by mechanism including the so-called pinch bars and the striker bar. The pinch bars are alsodriven from the shaft 8 which has secured to it a pinion meshing with a pinion 56 on the upper shaft 54 which carries the pinch bar 47, the pinions 55 and 56 also driving in a 1 to 1 ratio.

After the severance of the bag tube it passes on to mechanism which closes the bag bottom and this mechanism is of the usual and well-known construction and consists of upper and lower cylinders carrying respectively a tucker blade andby hand.

What I claim is:-

1 In a bag machine the combination with the` passes prior to being folded into a tube, means for driving said roller and means for rendering said drive ineffective at will. f

2. In a bag machine the combination with the former about which a web of paper is wrapped to form a bag tube and feed rollers for engaging the tube, of a roller about which the web of paper passes prior to being -folded into a tube, means including a belt for driving said roller in timed relation with said feed rollers and means for rendering said drive ineffective at will. .f

3. In a bag machine the combination with the former about which a web of paper is wrapped to form a bag tube and feed rollers for engaging the tube, of a roller about which the web of paper passes prior tobeing folded into a tube, means including a belt for driving said roller in timed relation with 'said feed rollers, an adjustable member bearing against said belt and means for holding Asaid member in different adjusted positions.

- GEORGE `w. PoPPE. 

